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Linamarase activities in Bacillus spp. responsible for aerobic digestion

McNeil, B. and Harvey, L.M. and Ugwuanyi, J.O. (2007) Linamarase activities in Bacillus spp. responsible for aerobic digestion. Waste Management, 27 (11). pp. 1501-1508. ISSN 0956-053X

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Abstract

Thermophilic Bacillus spp. isolated from thermophilic aerobic digestion (TAD) of model agricultural slurry were screened for ability to secret linamarase activity and degrade linamarin, a cyanogenic glycoside toxin abundant in cassava. Screening was performed by both linamarin - picrate assay and by p-nitrophenyl β-d-glucoside (PNPG) degradation, and results of both assays were related. Linamarase positive isolates were identified as Bacillus coagulans, Bacillus licheniformis and Bacillus stearothermophilus. Enzyme production was growth related and peak production was reached in 48 h in B. coagulans and 36 h in B. stearothermophilus. B. coagulans produced over 40 times greater activity than B. stearothermophilus. Enzyme productivity in shake flask was not strictly related to screening assay result. Crude enzyme of B. coagulans was optimally active at 75 °C while that of B. stearothermophilus was optimally active at 80 °C and both had optimum activity at pH 8.0. The thermophilic and neutrophilic- to marginally alkaline activity of the crude enzymes could be very useful in the detoxification and reprocessing of cyanogens containing cassava wastes by TAD for use in animal nutrition.

Item type: Article
ID code: 7555
Keywords: reprocessing, detoxification, toxin, modeling, agricultural waste, aerobic digestion, thermophily, pharmacology, Pharmacy and materia medica, Waste Management and Disposal
Subjects: Medicine > Pharmacy and materia medica
Department: Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences
Unknown Department
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    Depositing user: Strathprints Administrator
    Date Deposited: 14 Apr 2009 12:39
    Last modified: 04 Sep 2014 17:47
    URI: http://strathprints.strath.ac.uk/id/eprint/7555

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